The basic idea...

"The basic idea behind open source is very simple. When programmers on
the Internet can read, redistribute, and modify the source for a piece
of software, it evolves. People improve it, people adapt it, people
fix bugs. And this can happen at a speed that, if one is used to the
slow pace of conventional software development, seems astonishing...
...The Open Source pages exist to make this case to the commercial world." - Introduction to Open Source - www.opensource.org

* Android Cookbook

A community-written O'Reilly Cookbook about how to build great Android applications. In typical O'Reilly Cookbook style, it is full of how-to information along with code snippets that illustrate the ideas presented. We welcome contributions from anybody who has something useful to say about how to make great Android apps.